Doyle



(No Model.)

B. E. KILDOYLE. I LOW WATER ALARM FOR STEAM BOILERS. No. 422,803.

PatentedMar. 4, 1890;

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ATTORNEYS.

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UNITED STATES PATENT OFFICE.

EDVARD EDMUND KILDOYLE, OF YOKOI-IAMA, JAPAN.

,LOW-WATER ALARM FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 422,803, dated March 4,1890.

" Application filed September 16,1889- Serial No. 323,998. (No model.)

To. all whom, it may concern.-

Be it known that I, EDWARD EDMUND KIL- DOYLE', of Yokohama, Japan, haveinvented a new and Improved Low-Tater Alarm for Steam-Boilers, of whichthe following is a specification, reference being had to the annexeddrawings, forming a part thereof, in which- Figure 1 is a plan View ofmy improved steam-boiler alarm. Fig. 2 is a side elevation, partly insection; and Fig. dis a transverse section taken on line 00 a: in Fig.2.

Similar letters of reference indicate corresponding parts in all theviews.

The object of my invention is to provide a simple and reliable devicefor indicating low water in a steam-boiler.

My invention consists in the combination, with a pipe adapted forconnection with a steam-boiler at the water-line and provided with oneor more pockets, of one or more weighted levers pivoted in the pockets,a fillin g of fusible metal placed in the pockets and surrounding andsustaining the weighted lever or levers, and electrical connections andan alarm-circuit operated by the falling of the weighted lever, all aswill be hereinafter fully described.

The pipe A, which is adapted for connection with the boiler at thewater-line, is furnished with pockets a a a which project downwardlyinto the pipe and are open at the top thereof. At the bottom of eachpocket there is an ear Z), to which is pivoted a T-lever B, one arm ofthe T-lever carrying a weight C, the other arm being connected with awire D, which, together with the lever, the contact-point E, arrangedbelow the Weight 0, and a battery and alarm apparatus, (such as anelectric bell,) form a complete electric circuit, which remains normallyopen when the T-lever B is in a vertical position. The said T-lever B isheld in this position by fusiblemetal F, cast in the pocket at. Theseveral pockets contain fusible metal adapted to melt at differenttemperatures,so as to insure certainty in the action of the apparatus.The pipe A is connected with the boiler at the water-line, and so longas the pipe re mains full of water, there being no circulation therein,it remains cool; but when the water in the boiler drops below the mouthof the pipe A the water runs out of the said pipe, and steam takes itsplace and melts the fusible metal in the pockets, allowing the weigh tedT-levers to topple over, causing the weights 0 to strike the contact E,thus completing the electric circuit and giving the alarm. After thealarm. is given the Weighted T-levers B are held in a vertical positionin any convenient way until the water-level is restored and the pipe Ais cooled off, when the support of the levers is renewed and theapparatus is ready for another operation.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a low-Water indicator, the combination of thepipe A, provided with one or more pockets a, the weighted T-levers B,and the fusible metal F, substantially as specified.

2. In a low-water indicator, the combination of the pipe A, providedwith one or more pockets a, the weighted T-levers B, the fusible metalF, and the electrical connections, substantially as specified.

EDWVARD EDMUND KILDOYLE.

Witnesses:

G. ll. SCIDMORE, I JOHN MOLEAN.

